Getting going on restoration good-condition, working Pioneer SX-737.
I'm still relatively new. That is to say just four Pioneer and Kenwood integrated amplifier repair and restores under my belt. First receiver.
I plan to post progress reports and seek assistance from time to time. This will take several weeks. No rush -- do it right the first time.
Comments, suggestions and questions welcome.
Report 1:
Switches and potentiometers cleaned and lubed. Changed out AWX-071 C5 while I was in there. Had to jockey some wires out of looms and guides to get enough slack to move the control boards. Freed the equalizer board from its mounts in the process. Left it hanging out there for when the time comes to get to it. Not going to do the microphone board.
Lamp order in to Wojo. Going whole hog. Several were out but would have replaced all anyway. Staying all incandescent.
The following were all good. Power supply readings; fuse continuity; protection circuit amplifier output readings; power amplifier DC neutral voltages and idle current (bias and offset).
Note: service manual procedures for bias and offset are wrong. Link to correction.
http://audiokarma.org/forums/index.php?threads/notice-to-all-new-sx-737-or-7730-owners.464083/
Old fuses will stay in for the restore; will be replaced at end of project.
Next Moves:
Change out (electrolytic) capacitors, diodes and transistors in power supply.
Re-check power supply readings.
I'm still relatively new. That is to say just four Pioneer and Kenwood integrated amplifier repair and restores under my belt. First receiver.
I plan to post progress reports and seek assistance from time to time. This will take several weeks. No rush -- do it right the first time.
Comments, suggestions and questions welcome.
Report 1:
Switches and potentiometers cleaned and lubed. Changed out AWX-071 C5 while I was in there. Had to jockey some wires out of looms and guides to get enough slack to move the control boards. Freed the equalizer board from its mounts in the process. Left it hanging out there for when the time comes to get to it. Not going to do the microphone board.
Lamp order in to Wojo. Going whole hog. Several were out but would have replaced all anyway. Staying all incandescent.
The following were all good. Power supply readings; fuse continuity; protection circuit amplifier output readings; power amplifier DC neutral voltages and idle current (bias and offset).
Note: service manual procedures for bias and offset are wrong. Link to correction.
http://audiokarma.org/forums/index.php?threads/notice-to-all-new-sx-737-or-7730-owners.464083/
Old fuses will stay in for the restore; will be replaced at end of project.
Next Moves:
Change out (electrolytic) capacitors, diodes and transistors in power supply.
Re-check power supply readings.
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